turn test/SharedMemory/test.c into a gtest for CI unit testing in github

remove overly verbose printfs in importers
fix axis in r2d2.urdf

Extras/Serialize/BulletFileLoader/bFile.cpp

@@ -644,7 +644,7 @@ void bFile::preSwap()
 				swap(dataPtrHead, dataChunk,ignoreEndianFlag);
 			} else
 			{
-				printf("unknown chunk\n");
+				//printf("unknown chunk\n");
 			}
 		}